[texhax] Units in technical writing

[Joseph Wright]

On 29/12/2011 20:36, Philip TAYLOR wrote:
> Read with great interest, Johhny, but this one worries me :
> 
>> ampere      A
>>
>>     The ampere is that constant current which, if maintained in two
>> straight parallel conductors of infinite length, of negligible
>> circular cross-section, and placed 1 m apart in vacuum, would produce
>> between these conductors a force equal to 2 x 10–7 newton per metre of
>> length.
> 
> At this point, the Newton has not been defined ...

The formal tables put all of the base units together, but in the full
definitions it's clear that there is a required order. The newton is
purely a special name for kg.m.s^{-2}, all base units and none requiring
the ampere. The very formal 'proof' of this is somewhere in the BIPM
publications.
-- 
Joseph Wright